Abstract
The focus of this work was to examine the stability of gas nanobubbles in water. The generation of nanobubbles was carried out in two porous-membrane modules for two distinct values of liquid flow rate. Gas phase was nitrogen or oxygen, and the liquid phase was distilled water. Samples of nanodispersions were stored for 10 to 35 days. Half of them were stored open and other half closed to ensure or deny contact with the atmosphere, respectively. During storage Sauter diameter and zeta potential of nanobubbles were measured. Additionally, in the case of oxygen the dissolved gas concentration was measured. The result shows that stability and size of nanobubbles did not depend on whether samples were left open or closed. Obtained nanobubbles were stable for over a month and their Sauter diameter approached the value in the range 250–350 nm from different initial sizes. Additionally, the average zeta potential of nanobubbles in stable dispersions was between -10 mV and -15 mV in pure water without any frother additions. Furthermore, the discussion of reasons of stability of bubbles was carried out.
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